What time did aprenticeships work?

Does south and iron attract or repel? What does a gram weigh on a digital scales? What is the flugelhorn made of? What is an embossing machine? Why are bells made up of metals instead of wood? Which sounds from the bands will have the lowest frequencies high- pitched or low- pitched? How do electrical energy generated? How does energy from the sun affect the motion of molecules in a solid compared to molecules in a gas? What does the thomas theorem suggests about the possibility of encounter with ghosts? What is the name of the ray that represents the light reflected by the surface.? What wave occur when the motion of medium wave is parallel to the direction of the wave? When two objects collide the momentum of the pair after the collision is explain by which of newton's law? What is more stronger pipe cleaners or string? A system that does no work but which receives heat from the surroundings has? Does the mass of an object determines the rate at which it will fall? What does an efficient mean? Why does a old coin have a lower mass than a new one? What happen if the needle place on a small tissue paper and very gently put the paper on the surface of water? What happens when you split light into a spectrum? How much is 50kilo in pounds?

What time did aprenticeships work?